15241221 has 12 divisors (see below), whose sum is σ = 22527648. Its totient is φ = 9924264.

The previous prime is 15241201. The next prime is 15241223. The reversal of 15241221 is 12214251.

It is not a de Polignac number, because 15241221 - 2⁵ = 15241189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15241194 and 15241203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15241223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19305 + ... + 20078.

It is an arithmetic number, because the mean of its divisors is an integer number (1877304).

Almost surely, 2^15241221 is an apocalyptic number.

It is an amenable number.

15241221 is a deficient number, since it is larger than the sum of its proper divisors (7286427).

15241221 is a wasteful number, since it uses less digits than its factorization.

15241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39432 (or 39429 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 15241221 is about 3904.0006403688. Note that the first 3 decimals coincide. The cubic root of 15241221 is about 247.9361882736.

Adding to 15241221 its reverse (12214251), we get a palindrome (27455472).

The spelling of 15241221 in words is "fifteen million, two hundred forty-one thousand, two hundred twenty-one".